Jig for portable tools



-Nov 1, 1949. 'w. BINGAMAN 2,486,386

JIG FOR PORTABLE TOOLS Filed May 15, 1947 INVENTOR.

WILLIAM L. BINGAMAN ATTORNEY Patented Nov. 1, 1949 JIG FOR PORTABLE TOOLS William L. Bingaman, Folcroft, Pa.

Application May 15, 1947, Serial No. 748,329

(Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) Claims.

The present invention concerns a jig and particularly concerns a jig suitable for holding a portable tool such as a grinder relative to a piece of work and in which the jig is movable relative to the piece of work and the portable tool is movable relative to the jig.

In performing tooling operations such as grinding upon a piece of work such as ship hatch it is found desirable to provide a jig for holding the tool relative to the piece of work in order to eliminate manual holding of the tool. It is necessary that the jig be mounted for movement relative to the work in order that the tool can be adjusted into contact with the work along a selected path such as the straight sides of a hatch and the curved corners thereof. It is also necessary that the jig be constructed so that the tool be movable relative to the jig in order to provide further adjustment of the tool relative to the work.

. The present invention provides a tool-holding jig that fulfills these requirements. The jig is adapted for movement of translation or rotation relative to the work. The tool is held by a pair of arms that are hinged on the jig for rotation in a common plane to move the tool toward and away from the work. One of the arms is adjustable to vary its length so that the angular relation of the tool to the jig and the work can be varied. The base of the jig is mounted for sliding movement on a carriage forming part of the jig so that sliding movement of the tool towards and away from the work can be effected.

An object of the invention is to provide a jig for holding a portable tool relative to a piece of work.

Another object is to provide a jig for a portable tool in which the jig is provided with a pair of arms hinged on a base for rotation in a common plane to hold the tool and with one of the arms of variable length, and in which the base is mounted for sliding movement on a carriage mounted adjacent the piece of work.

Further objects and advantages of this invention, as well as its construction, arrangement and operation will be apparent from the following description and'claims in connection with the accompanying drawing in which the single figure is a perspective view of a preferred form of the invention.

In the drawing is shown a work bench ll having legs [2 and a bed 13. Mounted upon bed I3 is a piece of work l4 that is illustrated as being the hatch of a ship and provided with a bevelled surface l5 to be ground. Bevelled surface in- 2 cludes straight portions l6 and curved portions ll. Hatch I4 is provided with a flat face l8.

Detachably secured to face It by means of clamps I 9 (broken away for clarity of illustration) is a pair of parallel rails each provided with a groove 2| and secured together at their extremities by cross ties 22. Mounted for movement upon rails 23 is a flat carriage 2 la provided on its lower surface with rollers 22a which are disposed within grooves 2l. Resting upon the upper surface of carriage 2 la is a fiat support 23 that is adapted for sliding movement upon carriage 2 la. Mounted upon the upper surface of support 23 is a lug 24 adjacent to which is formed a slot 25. Extending upwardly through slot 25 is a lug 26 secured at its lower end to the surface of carriage Zia. Provided in lug 24 is a thrust element 21. A rod 28 is mounted for free rotation in thrust element 21 and at one extremity is threaded through lug 26 and at its other extremity is provided with a handwheel 29. Rotation of handwheel 29 effects relative movement between lugs 26 and 24 and thus between carriage Zia and support 23, respectively.

Extending upwardly from carriage 23 is a pair of parallel spaced lugs 30 and 3| through which extends a hinge pin 32. Mounted for rotation upon hinge pin 32 is an arm 33 to the outer end of which is secured clamp 34 for holding a tool as hereinafter described. Preferably, clamp 34 is flexibly mounted with respect to arm 33.

Mounted upon carriage 23 is a pair offrame elements 34a through the upper extremity of which extends a hinge pin 35 disposed in parallel relationship to the hinge pin 32. Mounted for rotation upon hinge pin 35 is a thrust block 33. Mounted for free rotation in thrust block 36 is a rod 31, one extremity of which is provided with a handwheel 38 and the other extremity of which is threaded into one extremity of a tube 39. The other extremity of tube 39 is provided with a clamp 40 that preferably is mounted flexibly with respect to tube 39 and is adapted to hold a tool as hereinafter described. Rotation of handwheel 38 varies the distance between thrust block 36 and clamp 40. Rod 31 and tube 39 together form an arm of variable length mounted for rotation in a common plane with arm 33.

Extending between frame members 34a below thrust block 36 is a crosspiece 4! provided with a thrust element 42. Mounted for free rotation in thrust element 42 is a rod 43, one extremity of which is provided with a handwheel 4 and the other extremity of which is threaded into one extremity of a tube 45. The other extremity of 3 tube is provided with a clevis 46 that fits over arm 33. A pin 41 extends through clevis 46 and arm 33. Pin 41 is parallel to hinge pin 32 and hinge pin 35. Rotation of handwheel 44 varies the distance between thrust element 42 and clevis pin 41.

Clamps 34 and 40 are arranged to engage a portable grinding tool assembly 48 that includes a grinding wheel 49 mounted upon a shaft 50 and a motor 51 for causing rotation thereof. Adjacent grinding Wheel 49 is provided a shield 52 having a dust-protection outlet 53 and a dust escape tube 54.

- In operation carriage 2 la is mounted with rollers 22a thereof in grooves 2| o'f'rails Z'Eifthe latter being secured in a selected position by 'Ihe'ans-bf clamps l9. Portable grinding tool 48 is mounted in clamps 34 and 40. Handwheel 2'9 -i s turned to slide support 23 into selected p'osi'ti'on upon carriage Zla. Handwheel 44 is turned to efiect rotation of arm 33. Handwlfeel 38 is turned to adjust the length of arm formed by red 3'! and tilbe 39 to position grinding wheel 45 in desired tilti'ng relation with respect to bevelled surface "it which is to be ground. By the adjustments assented grindin whee] 49 tan be brought into tom-act with bevelled 'wo'rk surface [5 in any desired relationship and rolling of carriage 21a aieiigra'ils 2t cau es grinding wn'ee1 49 to contact bevelled surface 'l5 along a path on the straight )oiftion 16 or bevenea surface 15. When it is desired to'grind a rounded corner I! on bevelled surface 15, ear'riage 2|'a is removed from rails 20 and a pivot (not shown) can be provided bein'ea'th carriage 2'l a'a'nd'dis'posed ii'i'a center pu'i'i'ch mark (not shown) of curved portion ll 'so that grinding wheel 4'9 describes an arciiate path in Contact with corner 1 1. v

F It is to be iiiiderstood that various mo'ai cations and'oha'nges may be made in this invention without departing from the spirit and scope thereof 'as set forth in the appended claims.

The invention described herein ma be manufactured and used by or for the Government of the United states for America for overnmental p'lliptiss Without the payment 61" any royaities thereon or therefor.

, 1. A jig for holding a tool relative toja piece of work, said jig comprising means defining a path relative to the work, a base mounted T61 movement along the path, and a pair "or arm individually hinged in spaced relation on "said base for rotation in 'ajc'oininen plane, said "arms b'ein'g 'afdaipted "to be fclain'pe'd tofa tool, at least one of said arms being adjustable to vary the length thereof anda'd'just the angle of'tiltof 'the tool relative to the base, said arms beingr'otatabl'e tegethe tofmove the tom relative tothebase.

2. A jig "for 'hd1di'ng"a tool relative to a piece er Work, said jig comprising a carriage adapted to be mounted relative to"alpiece of work, a base mounted 'for sliding movement along a path on saidcarri'age, means -fb'r sliding saidbas'a'a pair of arms individually hinged in "spaced relation on said base for rotation in a common plane substantially ndrliialto tne'patn, said arms being adapted to be clamped to atooLat Ie'ast oneof said arms being adjustable to vary the length thereof and adjust the angle of tilt of the tool relative to the base, said arms being rotatable together to move the tool toward and away from the base.

3. A jig for holding a tool relative to a piece of work, said jig comprising a carriage adapted to be mounted relative to a piece of work, a base mounted 'for sliding movement along a path on said carriage, means for sliding said base, a pair of arms individually hinged in spaced relation on said base for rotation in a common plane substantially normal to, the path, said arms being adapted to be clamped to a tool, at least one of said arms bei i-i'g adjustable to vary the length thereof and adjust the angle of tilt of the tool relative to the base, and means for causing rotation of saia arms 'to move the tool toward and "away 'irom the "base.

4. A jig for holding a tool relative to a piece of work, said jig comprising-a carriage adapted to be mounted relative to a piece 'e'i work, a ease mounted for sliding movement along 'a path on said carriage, means for sliding said base, apai-r of arms individually hinged in spaced relation on said base for rotation in a common plane substantially normal to the path, said arms being adapted to clamp a tool, -a't least one -'of saidarms being -adjustable to vary the length th'ereo'f and adjust the angle of 'tilt of the tool relative to the base, and a rod connected at one *end to one of said arms and at the otheren'dconnectedto-said base, said rod being adjustable to Wary the length thereof and rotate 'theco'rrne'cted arm'to move the tool toward and "away from the base.

5. A jig for holding a portable t'ool relative to a piece of work, said jig comprising a carriage adapted to be mounted for movement relative to the piece or work, a base dispose'd'in "sliding contact 'ti'rith sa-id carriage, -a first lug on said base on the side awa'y fromsa-id ca-Triage, a slot in said base-adjacent the first lug, a second 'lug on the carriage extending through *the slot, -'a screw connecting the lugs for translating-the lugs toward and {away from each -'o'ther to effect relative translation of said base-and carriage, a'pa'ir of arms individually hinged in spaced relation on said base for rotation =in' a'co'm'm'o'n plane, said arms remote -f'10'lh their -hing'e's being adapted to clamp a tool, said arms be'ihg disp'osed in substantially parallel relationship, at "least one of said arms being adjustable to 'vary the length thereof and adjust the angle of tilt *of the tool relative to said base, and areal-connected at one end to one of said arms and at the other end connected to :said base, :said rod being adj usta'ble to vary the distance :fron'i sa'i'd armt'o said base and rotate 'the connected arm to =move the tool towardand away f-romthe base.

WILLIAM BINGAMAN.

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